ASTM D976 PDF

Significance and Use 3. It may be employed for approximating cetane number where the quantity of sample is too small for an engine rating. In cases where the cetane number of a fuel has been initially established, the index is useful as a cetane number check on subsequent samples of that fuel, provided its source and mode of manufacture remain unchanged. Generally, it has been found that use of Test Method D results in less offset than use of Test Method D, but there can be specific cases where this is not true.

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More D It may be employed for approximating cetane number where the quantity of sample is too small for an engine rating. In cases where the cetane number of a fuel has been initially established, the index is useful as a cetane number check on subsequent samples of that fuel, provided its source and mode of manufacture remain unchanged.

Generally, it has been found that use of Test Method D results in less offset than use of Test Method D, but there can be specific cases where this is not true. Federal Diesel aromatics limit for diesel fuels containing less than ppm sulfur.

Scope 1. The index value, as computed from the formula, is termed the Calculated Cetane Index. It is a supplementary tool to estimate cetane number when used with due regard for its limitations. EPA to control diesel fuel aromatics concentrations via a 40 Calculated Cetane Index minimum is based on the correlation between Test Method D and aromatics concentration.

Test Method D is the preferred method as estimator of cetane number. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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